* culturel - Use of external cultural reference. The haiku is based on an external cultural element, well known by the reader. There is a sharing of an environment (place, situation...) or cultural element (music, painting...) that will seek memories or sensations in the memory and experience of the reader. This device saves a lot of space, nothing else is needed, the effect is achieved by the reader's contribution.

* allusion - Allusion to something known by the reader. This technique refers to something that is supposed to be known to the reader. This type of haiku only works for the reader who understands the allusion. It is often a cultural element or an environment shared between the author and the reader. The reference adds a note of complicity in the speech.

ex: Liberty Market: a chain of stores in the USA.

It can also be illustrated in jargon (specialized languages shared by a community).